Q26:
K is a set of integers such that if the integer "r" is in K, then "r+1" is also in K. Is 100 in K?
(1) 50 is in K.
(2)150 is in K.
Answer is A: Statement (1) ALONE is sufficient, but statement (2) alone in not sufficient.
请问这题到底是什么意思,是说如果一整数r在数集K中,则r+1也一定在,问100这个数在不在数集K中?
请教解题思路,谢谢! | 
